This is the free unlimited play version. The 3D version of Pong. This is the free unlimited play version. Curve Ball is a more challenging version of the popular arcade favorite, Pong. Make sure to hit the ball using the center of your paddle, which creates an angled trajectory and confuses your computerized opponent. If youlre feeling lazy, you can always leave your paddle in the left or right corner of the screen, as fifty percent of the shots seem to always go to these two locations.Point of the Game: Use tricky angles to sneak your ball past your computerized opponentls paddle.